Heater for raised printing and the like



Dec, 9, 1924.

S. LIPSIUS HEATER FOR RAISED PRINTING AND THE LIKE Filed March 12 4 0000000 0o0\00000- v00o0000`0000000ou-o0000olsg 0000 00 000000000000 0000000 000000000.. 00000000 0 0000000000 00000000 00.000.000@ 00000000 00000000, -000000 0.00 0000 00000000000 000900000.. 00000000000 000004 ,00 o 0 0 0N N0N0N0M0N0000QN0N-n-NQN0N0N0MQNA 00 0000000000000000000000000000000A j INVENTOR Patented Dec. 9, 1924.

UNITED STATES SAMUEL LIPSIUS, OF NEWTl YORK, N. Y.

HEATER FOR RAISED PRINTING AND THE LIKE.

Application led March 12, 1924. Serial No. 698,626.

6 York, have invented a new and useful Heater for Raised Printing and the like, of which the following is a specification.

My invention relates particularly to apparatus of the type of my former Patent #1,149,455. The main object is to provide a more eiicient heater for fusing the powderon the paper or other stock or drying gum and the like.

In the past it has been considered necessary to make such a heater of considerable length and to use an excessive amount of gas in order to get the uniform and yet adequate temperature required. One of the objects of my invention is to provide a more compact machine which will require a minimum amount of fuel.

Another object is to get uniformity of action at a minimum expense.

Fig. 1 is a plan view of a machine embodylng improvements of my invention, parts being broken away.

Fig. 2 is a vertical longitudinal side view and partial section of the same.

Fig. 3 is a longitudinal diagrammatic seotional viewand vertical projection showing a modification.

The frame of the oven preferably has two side plates 5, 5 supported by a suitable standard 6. The space between these side plates is covered by a hood 7 for confining the heat.

The conveyer 8 is preferably a suitable type of wire mesh such as interlinked helices of wire formed into a continuous apron passing around the rollers or drums 9 and 10 at opposite ends of the machine. This conveyer is driven by any suitable means such for instance as a motor 11 suitably -geared or connected to it. At the entrance end I preferably provide a guide or support 12 and at the exit is a cooling conveyer 13 for taking awa the finished product.

Wyithin the chamber of the heater or oven is arranged one or more burners. In the preferred form each burner has transversely extending pipes 14 and 15 and end-pipes 16, 16 forming a sort of tubular frame work and having mmute exit passages. In the form shown in Figs. 1 and 2 there are two burners connected to the supply pipe 17 and each burner has a regulating` air valve 18 so as to get the proper combination between the supply of air and gas.

Between the burner and the conveyer 8 I arrange a baffle plate or member in the form of a foraminous sheet of metal such for ins tance as a perforated sheet. The perforatlons in this sheet preferably extend throughout its entire area and the baffle extends from one side plate 5 to the other. This baffle serves not only to uniformly distribute the heat of the burners but prevents the direct fiame from coming against the sheets on the conveyer. I may provide one or more rollers or guides 20 for the conveyer to keep it spaced away from the baffle plate 19. The baffle plate may be corrugated as at 21 to clear these rollers. In this construction I require a. minimum amount of gas which is burned in a large number or mass of jets of comparatively small size as distinguished from the small number of large jet burners used in former constructions. By this means I cover a much larger area more minutely and give a more equal distribution of the heat over a given area. The perforated baiiie plate serves to make the distribution of the heat more uniform and yet I have found that the ame from the burners does not pass through the baffle plate although the currents of air do pass through. In this way I obtain the full benefit of the high temperature of the burners without danger of injuring the stock and I am able' to get the requisite high temperature by the use of la minimum amount of gas in a minimum time.

The cover or hood 7 may be held in place by detachable bars or straps 22 snapped over the edges of the side plates 5.

In the form shown in Fig. 2 there is but one burner 23 formed like the burners in Figs. 1 and 2. This construction also re` quires only a single conveyor 24 to carry the sheets through the heater and out into the air where they are cooled ofi".

The side plates may have holes for inspection of the work and to facilitate lighting the gas. Openings may also be provided in the bottom for admission of air.

According to my present invention I am able to secure efiicient and satisfactory operation of machines only a small fraction of the size of machines formerly thought necessary. This notonly greatly reduces the cost of the machines but also means. a great saving in sp-ace in the shop which latter feature I have found from commercial experience is :of very greatv importance.

I claim:

1. A heater for raised prin-ting comprising an oven, a gas burner mounted in said oven, a conveyer for carrying powdered sheets through sa-id oven over said burner, and a foraminous baiiie plate interposed between said burner andrsaid conveyer` for permitting the passage of hot air through said plate to the stock on said conveyer, the holes in said plate being su'liciently small to prevent the direct passage of llame from said burner.

2'. A heater of the character described,

. comprising an oven, a conveyer having at least one portionI movable through said oven, a gas burner mounted within said oven, and having substantially parallel tubular portions extending from side to side of said oven and having small outlet openings, and a baille plate interposed between said burner and said conveyer and extending from side to side of said plate above said burner, and having a large number of passages.

3. A raised printing heater, comprising an oven, a conveyer for carrying powdered sheets through said oven, a gas burner extending from side to side of .said oven, a baille plate extending from side to side of said oven between said burner and said conveyer and having multitudinous small pass es and a roller extending from side to si e of said oven between said plate and said conveyer for guiding said conveyer out of contact with said plate.V

4. A heater comprising 'an oven, a gas burner mounted in said oven, a conveyer or carrying powdered sheets through said oven, and a corrugated foraminous baille plate interposed between said burner and said conveyer for permitting the passage of hot air through Said plate to the sheets conveyed on `said conveyer.

5. A heater' of the character described, comprising an oven, a conveyer having at least one portion movable through said oven, a gas burner mounted' within said oven, and having substantially parallel tubular portions extending from side to side of said oven and a baille plate yinterposed between said burner an having minute outlets, a baille plate ex.

tending from side to side of said oven between said burner and said conveyer and i having. small openings, a guide extendin from side to side of said oven between sai plate yand said conveyer for holding said conveyer out of contact with said plate, said baiiie plate having a grooved portion beneath said guide. p

7 A heater for raised printing compris'- ing an oven, a gas burner'mounted in said oven, Ia single conveyer for carrying powdered sheets through said oven and having an elongated cooling portion outside of said oven, and a` foraminous baille late intersaid conveyer within said oven for permitting the which is directly passage of hot air through said. plate to the sheets conveyed on said conveyer, the holes in said plate being suiiiciently small to prevent the direct passage of flame from said burner.

8. heater of the character described,

comprising an oven, a conveyer having at f least one portion movable through said oven and an integral extension for cooling outside, a gas bu-rner mounted within said oven, and havin tubular portions extend' side to si e of said oven within smal out# let openings, and a baiile member interposed between said burner and said conveyer and havin a large number of openings arran above said burner.

9. A heater, comprising an oven, va conveyer `for carrying powdered sheets through said oven, and having an elongated cooling extension, a gas burner extending from side to side of said oven, a baiie extending from side to side of said 4oven between said burner and that part of posed between said burner and said conl veyer and having a large number of small SAMUEL LIPSIUS.

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